Physics
The splitting of different colours of light in a prism is :

Diffraction of light
Reflection of light
Refraction of light
Disperson of light

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Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient
If you conserve energy you will not be as tired

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Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
the pressure inside is less than the pressure outside.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure is the same as that outside.

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